What it means
Tax systems often accept that a person needs a basic amount of income just to live. A personal exemption reflects this by shielding a set amount from tax.
Because it is deducted from income before the tax rate is applied, it reduces tax by the exemption multiplied by the taxpayer's marginal tax rate (the rate on the last dollar of income). In systems that use exemptions, a taxpayer might claim one for themselves, one for a spouse and one for each dependent child.
The amount per person was fixed by law and was often adjusted each year for inflation. A larger family therefore received a larger total exemption, which recognised the cost of supporting more people.
The exemption is different from a tax credit. A credit reduces the tax itself, dollar for dollar, whereas an exemption reduces taxable income, so its value depends on the taxpayer's rate.
A person in the 22% bracket gains 22 cents for each dollar exempted, while a person in the 10% bracket gains only 10 cents. High earners were often subject to a phase-out, which reduced or removed the exemption as income rose above a threshold.
This made the benefit more targeted at middle and lower incomes. Finance and payroll teams still need to know the rules, because employees may refer to exemptions and allowances on forms or when asking about withholding.
The nuance is that rules change often. Governments can raise, reduce or abolish exemptions in favour of larger standard deductions or credits, so anyone preparing a tax calculation should check the rules for the tax year and country in question rather than relying on older figures.
Official tax authority websites publish the current amounts.
In practice
Real-world examples.
Example
A father with two children and a non-working spouse claims four exemptions in a system that allows them. His taxable income falls by four times the exemption amount, which reduces his tax bill. At a 22% marginal rate, four exemptions of $4,000 each save him 16,000 x 0.22 = $3,520.
Example
A payroll manager updates withholding tables when the government changes the exemption amount. Employees' take-home pay changes slightly as a result. She also sends a short note to staff explaining the change.
Example
A tax adviser compares a system with a $4,000 exemption per person to one with a larger standard deduction. She shows a client that the larger deduction helps single people more, while the exemption favoured big families. The client decides to plan around the system that is currently in force.
Formula
Calculation
Tax saved = number of exemptions x exemption amount x marginal tax rate
Suppose a country allows an exemption of $4,000 per person, and a family of four claims all four. The total exemption is 4 x 4,000 = $16,000. If the family's marginal tax rate is 22%, the tax saved is 16,000 x 0.22 = $3,520. A single person in the same bracket would save 4,000 x 0.22 = $880.Case study
Seen in the real world.
Maple Ridge is an illustrative, fictional country that allowed a personal exemption of $5,000 per person. A household of five had taxable income of $90,000 before the exemption.
The five exemptions totalled 5 x 5,000 = $25,000, so taxable income fell to 90,000 - 25,000 = $65,000. At a marginal rate of 24%, the tax saved was 25,000 x 0.24 = $6,000.
When the government replaced the exemption with a larger standard deduction, large families saw their tax rise while single taxpayers paid less. The illustrative lesson is that a small change in how allowances are designed can move the tax burden between groups. The government published a table showing the winners and losers for several typical households before the change took effect.
Watch out
Common mistakes.
- Confusing an exemption with a credit, when an exemption lowers taxable income and a credit lowers the tax itself.
- Using an old exemption amount in a calculation without checking whether the rules have changed.
- Forgetting that high earners may lose the benefit through a phase-out.
Questions
People also ask.
What is the difference between a personal exemption and a standard deduction?
An exemption is a set amount per person, while a standard deduction is a set amount per tax return that depends on filing status.
Does the United States still have a personal exemption?
The 2017 tax reform law reduced it to zero for the years that followed, so taxpayers rely on the standard deduction and credits, and current rules should be checked.
How much tax does an exemption save?
It saves the exemption amount multiplied by your marginal tax rate, so it is worth more to taxpayers in higher brackets. For that reason, some systems add a phase-out for high earners. A taxpayer in the 10% bracket would save only 4,000 x 0.10 = $400 per exemption.
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